The structure of your lower back is extremely complex. It contains numerous ligaments, tendons and nerves that may be injured or irritated. The lumbar area supports your body, and pain in this area can range from limiting and irritating to chronic and debilitating. When you stand your lumbar area bears the weight of the upper body. When you bend at the waist, your lumbar area plays a major role in the movement. Back spasms hinder your ability to perform these actions.